BioMedical Admissions Test (BMAT) Practice Test

The efficiency of an appliance is calculated by taking the amount of useful energy it transfers and dividing it by the total energy supplied to it. This calculation helps to determine how effectively the appliance converts the input energy into useful output energy. When you look at the formula, it illustrates the concept that efficiency is a measure of performance, indicating how much of the energy utilized by the appliance is transformed into useful work as opposed to being wasted. The higher the ratio of useful energy to total energy, the more efficient the appliance is considered. In contrast, other options do not accurately represent the concept of efficiency. For example, dividing useful energy by energy consumed does not distinguish between useful and wasted energy in the context needed for efficiency. Additionally, adding the useful energy transferred to the total energy supplied would not yield a meaningful measure of performance, as it ignores the waste aspect entirely. Thus, the formulation chosen reflects the fundamental principle of efficiency accurately.